Which are the numbers of rational numbers?

Answer 1

There are an infinite number of rational numbers.

Rational numbers are any number that can be expressed as a ration between 2 other numbers. 2 for example is a ratio of 2/1, 10000 = 10000/1, a half or 0.5 = 1/2 a third or 0.3333333333333reaccuring = 1/3 etc. Irrational numbers are those numbers than cannot be expressed no matter how hard we try to by dividing 2 numbers. Good examples of Irrational Numbers is square root of 2 (gives us 2 irrational numbers) and the ratio of a circles circumference to its diameter otherwise better known as pi (3.14159265etc,etc,etc). It is from this that we get the word irrational meaning beyond common sense.